Question

Write the electronic configuration of alkali and alkaline earth elements. ,

Answer 1

ALKALI METALS
group 1st A elements exept hydrogen are called alkali metals.its electronic configuration is
1) Li = 3 = 1s2,2s1
2) Na= 11 = 1s2, 2s2 ,2p6, 3s1
3) K =19 = 1s2 ,2s2,2p6,3s2,3p6,4s1.
4) Rb = 37 = 1s2,2s2, 2p6,3s2,3p6,4s2,4d10 ,4p6,5s1.
5) cs = (55) = xe 6s1
6)Fr= 87 = (Rn) 7s1.

ALKALINE EARTH METAL
THE elements of group || A are called alkaline earth metals .
1) Be = 4 = 1s2 2s2.
2) Mg =12 = 1s2,2s2 ,2p6, 3s2.
3) Ca = 20 = (Ar) ,4s2
4) Sr = 38 = (Kr) 5s2
5) Ba = 56 = (Xe) 6s2
6)Ra = 88 = (Rn) 7s2.